Charts Guide: Looker Studio (A-Z) Charts Explained
Looker Studio (Formerly known as Data Studio) Charts explained with an example and use case scenario
Looker Studio (Formerly known as Data Studio) Chart Guide
Line charts are best for tracking changes over short or long overtime. Compare how several things change over time relative to each other. When minor changes exist, line graphs are better than bar graphs. So If you hear that key phrase "over time," that’s your clue to consider using line charts for your data.
Combo charts use both axes to show a comparison between different KPIs. They work in a similar way to Column charts except with the option to configure how to display individual metrics (Line and Pub/Bar). The right axis is often used If a data set is significantly smaller than the rest of the KPIs.